જો $f(t) = \int_0^\pi \frac{2x \, dx}{1 - \cos^2 t \sin^2 x}$,જ્યાં $0 < t < \pi$,તો $\int_0^{\frac{\pi}{2}} \frac{\pi^2 \, dt}{f(t)}$ નું મૂલ્ય .......... થાય.

  • A
    $3$
  • B
    $9$
  • C
    $1$
  • D
    $7$

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જો $\int_0^\pi {x\,f({{\cos }^2}x + {{\tan }^4}x)\,dx} = k\int_0^{\pi /2} {f({{\cos }^2}x + {{\tan }^4}x)\,dx,}$ હોય,તો $k$ ની કિંમત શોધો.

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ધારો કે $f(x) = \int\limits_1^x \frac{\tan^{-1} t}{t} dt$ જ્યાં $x > 0$. તો $f(e^2) - f\left(\frac{1}{e^2}\right)$ ની કિંમત શોધો.

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